Inscription

lower left in plate: Painted by Benjamin West. / Historical painter to His Majesty; lower center in plate: Agrippina / Publish'd. July 1st, 1776 by John Boydell Cheapside London; lower right in plate: Engrav'd by Richard Earlom 1776; by later hand, lower right in graphite: M7 37; by later hand, lower left in graphite: P22955 LUB 61 i/ OHL / CLB; by later hand, upper left in graphite: 16